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From what I've heard, Kubo decided to end it when himself because his physical condition could not take it anymore. This is supported by Kubo having surgery soon after and canceling all event appearances in the months following the ending.
Supposedly, Kubo had been dealing with issues in his hand and shoulder, as well as frequent bout of illnesses, since around the time of the Fake Karakura Town portion of the Arrancar arc.
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